1 Department of Community and Family Medicine, Duke Clinical and Translational Sciences Institute, Duke Cancer Institute, Duke University School of Medicine, Durham, North Carolina.
2 School of Social Work, North Carolina State University, Raleigh.
3 Division of Geriatrics, Department of Medicine, Duke University School of Medicine, Durham, North Carolina.
4 Geriatrics Research Education and Clinical Center, Veteran Affairs Health System, Durham, North Carolina.